Electric motor.



L. A. MUGOUBRIE E c. P. RAYDURE.

ELECTRIC MOTOR.

APPLICATION FILED APR. 29, 1909.

943,155'. Patented Dec. 14,1909.

` nume-.9:04 C5 TTU/MEV.

UNITED STATES Pr/XTENT tillilfllllE.

LOUDEN A. MCCOUBRIE ANT* CHARLES F. RYD'URE, 3F PI-lllLAELEHEt,

` PEXNNSYLVANI..

- ELECTRIC MSTOR.

kSpecification.of Letters Patent. Pgitgntg 1913. 14:, J.,

Application iled April at), i909. Serial No. 493,061.

of electric-motors free from rib t'ori'riations or projections, which cause arc drawing and sparking, and it is highly desirable to pre rent such formations, which. is the principal object of our present invention. v lOur present invention will be more fully understood from the Jfollowing description in connection with the accompanying drawings forming part hereof, in which# Figure l, is a vertical sectional View through a casing' or housing for an electric niotor having carbon or other brushes atl- `iustably suspended from brackets in such relation with respect, to the coninnitator to not only insure spring Contact ot' the brushes therewith but to also prevent rib formations or projections being 'oriiietl around the coniiiiutator faces, the ine einbodyii'ig,` iiiain features of our said ii. fention. Fie'. 2, is a top or plan View7 showingl the ar rangement ot a plurality ot carbon-brushes on cach side of the coinn'iutator and preferably set at 900 apart, as is usual in car niotors, and with iiieans for iiiaiiitaiiiing` each iii Contact with the said eoniinu, tor. Fig. 3, is a rear elevational View ot' nieans for holding' the carboii-brushes under spring tension troni thc brush-holders, for use in contact with thel coiiiniiitator. Fig. 4, is a vertical central sectional View through one of the brush-holders provided with a pl rality ot' carbonbrushes, one being of ay ferent size from the other in each set, and showingl alsoin detail the arrangement of the spring tension device 'to maintain the said plurality brushes of each of said holders in direct surface Contact with 'the coininiitator; aiitl Fig. 5, is a diagrammatic plan View of a coininutator lairl out flat and the different size plurality brushes oit each ot said holders, the brushes of the respective holders being in such a position as to occupy staggered relationship in respect to one an- 'Those brushes are other in contact with thev coniniutator, the saitlv View disclosing as such, essentially, iiiaiiiytcatiires of our said invention.

"llct'crriiig` to the drawings a metal casing' of suitable torni.y tor housing the electric-motor l, havin;l a ci'iiiiinutaior o, iouriialerl on both sides at lit, iii the casi g fi. as clearly illustrated iii Fig, il. C, is a briish-luililcr recess/eil at c, on cach siile oi a central roil or support o1, anti o riilcrl with ljournals r, 'tor atljustalily sup f poi-tuna;` the holrlcr in the sleeve (l, ot a tii'arltet l winch is bolted at al?, on each siilc ot the couiuiutator to the casing r., as

clearly illustrated in Figs. l and il. in the recesses c. ou both sides of the central roti or support el, oi the liolffler are mounted piro'icd tongues 3, having coiled springs ce, passing arounil trio bearings of said tongues, with the cntls respectively, suitably Connectletl with thc holrler unil tongue. In the front ot the holiler is pi'oritlerl an oblonp slot with a partition c, so to ilivitle the holder into two openingsl ot tliti'orent size for re wiring carbon or other brushes c anti el. helft in the slots therefrom in contact with the ooininutator b,

by uieansl otl the springl controlled tongues ri". as illustrated iii l and 2. These holrlcrsl with their iliiiciiut brushes i' :intl (il on both sitios ot' the couiuiutator t), set as shown at an anglo ot filiKV thereto. occupiv staggered relationship to our aiioll'ier -iii contat-t with the coiiiiuutator as illustrated iii Fig. 5. whereby iu thc operation ot the ooiuuiutaioi', with thc brushes so arranged is prorouteil riii aiiil other 'torinationsl on the rfoiiiiiuitator auil thus the usetulncss ot' the coiiiiiiutator is prolonged youd present (lar uses of such as well as airing :iiul spankingI between 'the comunitator aiiil the brushes oi' the saine aroitlct.

lluviiigr thus (lcscribeil the nature :intl oir jects ot our invention. what weclaiiii as new :intl (icsii'o to secure by Letters 'latci'it' is :W- .l'ii an olectric-iiiotor, a coiiiniiil'ator.bruslr holders. each consisting' ot a hollow casting at, and

carbon# having the ends vlrespecpive'l'jy connected with our signatures in the presence of' the two szud holders and`tongues so as to mamtaln subscrlblng Wltnesses.

under sprinv tension said brushes in con- 4 -Y l met with thecommutator 'to prevent rib and 's oiher formations as Well as sparking or arf:

drawing 'beween said. commutaor and @Vtnessesz f brushes thereof. A J.WALTER DoUGLAss.' In Wrtness whereof, ,We have hereunto set i THOMAS M. SMITH. 

